Thank you so much for you insight juvela, what you have provided so far is super helpful. I am wondering if these frames have been built by some artisan frame builder that may be impossible to identify. Here are some more photo's of the white frame plus the parts that came off the brown/white frame. I can confirm brown/white frame has a recessed brake mount on the bridge.





brown & white frame parts

brown & white frame cinelli bars and stem

brown & white frame mavic wheelset with 6 spd regina freewheel